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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for June 10, 2008
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Open Help Requests for GM
Help Request Answers
1997 Cadillac DeVille 4.6L MIL Lamp on VIN: 1G6KD54Y4V
well first i would again like to thank all for the previous help on this one. i thought all was well on this vehicle after cam timing set properly. we had been fighting a p0340 code. i was performing final test drives to verify repairs when cel light popped on... Trouble codes: P1139 (ho2s insufficient switching bank 1 sensor 2 pre-converter), P1140 (ho2s transition time ratio bank 1 sensor 2 pre-converter), P1571 (traction control system pulse width modulated circuit no frequency), P1632 (theft deterrent system fuel disabled)
1999 Cadillac Seville STS 4.6L no compressor engagement VIN: 1G6KY5498X
customer had at another shop charged a/c system.compressor does not engage.pulled codes i am getting code 1605 loss of hvac serial data.alldata gives no specific tests.connected tech 2 to activate compressor still no luck.checked all fuses /power to relays eve...
1994 Chevrolet C2500 Cheyenne 6.5L MIL Lamp on VIN: 2GCFC29S3R
Truck runs ok, no stalling, a little hard to start but not bad for the mileage. Have read the updated TSB but it only confirms what I already knew...the problem is intermittent..end of trouble tree...gotta love it. Injection Pulse width is not frozen but hover... Trouble codes: 35 (36 -), 36
1997 Chevrolet Lumina 3.1L No Start VIN: 2G1WL52M5V
This is my sons car. I am retired so that I dont have access to all the books etc. I do have a OBD-II Scanner. The problem is on a very hot day the engine will shut off while driving or standing still. The gas gauge will go to full. There will be no ck engine ...
1997 Chevrolet C1500 4.3L Hesitation, Cuts out, MIL Lamp on VIN: 1GCEC14WXV
This truck came in about 2 weeks ago with a locked up ac compresser. After putting a system in I road tested truck and just as I was getting back to the shop the truck began to loose power and started bucking and cougfing through the throttle body. I drove a l...
1999 Chevrolet Tahoe LS 5.7L Cuts out, Stall, MIL Lamp on VIN: 1GNEK13R2X
when vehicle came in cust states car would hardly run and buck and surge . i drove it and it feels like it is just shutting down with scanner on it i have po335 ckp interm and while driving the only thing i can see is when graphing data is rpm is spiking to 75... Trouble codes: P0339
2000 Chevrolet C6500 7.4L ebcm VIN: 1GDE6H1B1Y
No communication with scan tool. Found corroded and broken wires going into the ABS module under the vehicle, Repaired wiring to the ABS module. Codes: C0241, C0242, C0245, C0246, C0251, C0252, C0255, C0256, C0265, C0267, and C0281. Codes C0241 - C0252 are EBC...
2000 Chevrolet Silverado 1500 5.3L Poor Idle Quality, Misfire
This truck runs rough at idle and engine light on, was the concern. check plugs and wires ok. Pressure check fuel system, Had 49 psi. Spec is 55 psi. pinched off return line, no change. if anything dropped 1 psi to 48 psi. Replaced fuel pump. Pressure increas...
2001 Chevrolet Silverado 1500 5.3L Safety VIN: 2GCEC19T41
We have this vehicle that keeps coming back into the shop. The problem is that the red brake light and the yellow ABS light will come on intermittently. Turn engine off and the lights go away...sometimes. We have checked the entire braking system and find noth...
2001 Chevrolet Impala 3.4L MIL Lamp on VIN: 2G1WF55E71
OK Here we go. Car came in for service and Engine light on. This thing will not comunnicate with the scanner (Snap-On Brick) in either generic or vehicle specific mode. Checked all the fuses and fuseable linkes. Also checked the aldl and the ground and and the...
2003 Chevrolet Trailblazer North Face 4.2L throttle body VIN: 1GNDT13S73
there is a ratcheting type of noise coming from the throttle body when first turning key to run position. I suspect I need to replace the tb assembly, just wondering if anyone has had experienced this.
2004 Chevrolet Trailblazer EXT LS 4.2L blower motor VIN: 1GNES16SX4
2004 trailblazer rear blower motor works only with driver control switch . passenger blower motor switch will not turn on auxillary blower motor . has anyone seen this before . wires on rear blower switch are not changing in voltage or signal at all . may be f...
1996 GMC Savana 2500 5.7L IGN A fuse VIN: 1GTFG25R1T
Vehicle was towed in with a no crank situation and dash warning lights or gauges inoperative. Traced problem to blown 40amp IGN A fuse in underhood fuse box. Checked for shorts in circuit from fuse panel to ignition switch to starter. Tried replacing starter -...
2002 GMC Yukon XL 1500 SLE 5.3L Misfire, MIL Lamp on VIN: 3GKFK16Z12
Thanks in advance for all your help! I have this truck that will only misfire for about five seconds on a hot soak condition, 1 out of five times. When the problem occurs all even bank cyls. experience misfires. When this is happening cyl. #6 counts three time... Trouble codes: P0306 (6 cyl misfire), P0300 (random misfire)
1995 Oldsmobile Aurora 4.0L no power VIN: 1G3GR62C6S
car came in with miss,found bad plug.replace plugs and miss is now gone,but the car has no power and vacuum is low.car runs good but has no power at all.I have block egr valve,and brake booster,no help.sorry I can't give you any data I don't have a scanner for...
1995 Oldsmobile Aurora 4.0L Poor Idle Quality VIN: 1G3GR52C3S
the Ics motor Ratchets when the key is turned on or off, makes no adjustment to idle speed, the idle speed starts out at 1500, then climbs to excess of 3000 rpm,exhaust superheats to the point of causing a fire in less than 5 mins, so running the vehicle for a... Trouble codes: 52 (Snap on Modis internal fault in PCM historical), 109 (Snap on Modis Checksuum error cant read romhistorical)
2005 Pontiac Grand Am SE 3.4L cruise VIN: 1G2NE52E25
hello everyone in iatn land. we have got an ever since today. we replaced ts switch & clockspring on this car 2 months ago. cust states cruise hasn't worked since. testing switch signals at module reveal no problems with switch, clockspring or wiring. looking ...
2000 Saturn LS2 3.0L service engine soon VIN: 1G8JW52R4Y
The service engine soon light is on, after diconecting the battery while cleaning the mass air sensor the light went out but still read the same codes and sfter about 6 restarts the light came back on. The car seems to run fine, smooth idle, good power but the... Trouble codes: P0171 (lean bank one), P0174 (lean bank two)

Fixes & Summaries for GM
Fix/Summary Answers
1999 Buick LeSabre Custom 3.8L Cuts out VIN: 1G4HP52KXX
2002 Buick Rendezvous CX 3.4L ac compresor inop VIN: 3G5DA03EX2
i took the advice many of you gave me and recomended to the costumer to replace the BCM, but since we do not have the ability to flash the new BCM, we sent our cust to the dealer, and as of let have not heard back, we need to update and exspand our scanners, b...
2001 Cadillac Catera 3.0L abs/tcs VIN: W06VR54R51
The customer opted to not repair this vehicle. Most of the responses confirmed what I thought to be the case here and that's the EBTCM has a high failure rate in these cars. One of the responses suggested I try module masters for the replacement. I had alre...
1991 Chevrolet Corvette 5.7L No Start VIN: 1G1YY2380M
got 6 replies. Alva said to check inj relay behind battery. not sure what he meant by that. no such part as far as i can tell. David said he had a similair deal and it resulted in being a consolidated reman part issue. that was not the case here. Michael sugge... Trouble codes: 41 (hist dtc stored in ccm loss of ecm comm), 54 (hist dtc stored in ccm fuel enable failure).
2001 Chevrolet Cavalier 2.2L Poor Idle Quality, Hesitation, Misfire VIN: 1G1JC22411
Thank you for all the suggestions, it appears this one may be fixed as it has not acted up for a while. Replace crankshaft sensor first and then ignition module. Thanks again Trouble codes: P0301.
2007 Chevrolet Express 3500 6.0L Lighting VIN: 1GAHG39U87
Thanks for the replies. I never did find the factory wiring. It looks like the factory setup uses a couple of relays also(which were not there) to power the turn signals and parking lights, so customer just opted to put in the aftermarket trailer wiring kit.
1989 Oldsmobile Delta 88 Royale Brougham 3.8L engine VIN: 1G3HY54C8K
Iím really sorry to bother you for Iím 70 years old and I though I had a computer problem! My ex boss told his man to fix it and it took him three weeks to put in a lower control arm that I furnished. The engine was running OK but was pulling to the left. I di...
1998 Oldsmobile Cutlass 3.1L Cuts out VIN: 1G3AJ51W6J
Well thanks for all the help i tried everything and lost. new crank sensor comp. ign switch . coolant temp. and nothing same effect . win some lose some
2001 Oldsmobile Alero GX 2.4L instrument cluster VIN: 1G3NK52TX1
After replacing BCM with no luck, we rechecked all powers and grounds to cluster and radio. Everything checked out fine voltage wise. I think our problem was amperage. We found a lot of moisture and green corrosion in the main fuse panel. Pulled fuse panel and...
1988 Pontiac Firebird 5.0L Stall, timing won't set VIN: 1G2FS21E5J
I'm sorry, but I had to put this car on the back burner for a while. I have to close this post for now due to time allowances. I'll add the repair info when I get back on it. I tried another ecm with no changes.
1996 Pontiac Grand Am SE 3.1L starter VIN: 1G2NW12MOT
I,m sorry I thought I closed this. I wanted to thank Glen for keeping me on track. I ran a jumper wire from the red wire going to the switch to the yellow wire going to netural saftey switch. The car cranked over. I didn't think the electrical part of the swi...
2000 Saturn LS1 2.2L compressor fuel gauge VIN: 1G8JU52F61
Thanks for the responses. I have recommended that the BCM be changed, based on current replies and results of archive searches with similar problems. No money right now so I will update when she has it done. Thanks again for your input!!!
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